Chisel-retainer lock



y 6, 1930. R. A. NORLING 1 ,757,093

CHISEL RETAINER LOCK Filed June 28, 1923 3 /2 I I V O Y 7 iii" 0' Patented May 6,

. UNITED srA \REINHOLD A. moraine; or AURORA, \ILLINQIS, ns'sreivon T0 INDEPENDENT: PNEUP m'rIc 'rooL COMPANY, or CHICAGO, ILLINQI SA: oonronnrron ,QFDEIJAWARE I i Application filedi lfune 28,

This invention relates tomeans for locking chisel retainers .on the barrels of pneumatic rlveting hammers and thus hold the retainers from beingljarred or otherwise loosened off said barrelsduring running .of the tools,

Fig. 2 is an enlarged fragmentary l0ng 1 tudinal vertical sectional viewthrough the forward end of the barrel and attached chisel retainer on line22 of Fig. 1; Fig. 3 is a transverse sectional view taken, on line 33 of Fig.2; and V Fig. 4 is a perspective view of the spring locking ring to be hereinafter described.

In the drawings, I have shown a pneumatic riveting hammer having a'barrel 1 carrying at its forward end a chisel retainer'vembody ing the features of my invention. By the use of such retainer a chisel 2 may be applied to the hammer and permit the use of the latter for cutting oif heads of rivets in repair or.

other wor r i if The retainer q lldesan outside sleeve 3o and an inside sleeve 4, each m ade in one pieceand with the outside sleeve 3 appliedover. the 5 forward end of the barrel land projecting forwardly beyond the-same,-as shown in Fig. 2, The inside sleeve 4 fits about the shank of the chisel 2 and permits the use of a chisel with an un-reducedshank.r The forwardend of the sleeve 3 has an inwardly extending flange 5, and the sleeve 4' adjacent the end of the barrel-1 has an outwardly extending flange- 6., 'Betweenthese flanges5 and )6 is placed a cushion means 7 preferably in the form of'an annulus or ring ofrrubber. The rubber ring 7 is carried by the sleeve 4 extending between the flanges 5 and: 6. Plugs 8, 8v 1 carried by thesleeve 4 and engaging the bore of the barrel 1 at its forwardend are ems ployed to hold the sleeve 4 in the barrel, in

the same manner 'asdescribed and claimed rel 1 is provided on the-outside at its forward end with a coarse screw thread 9, andthere ,7 in diameter than the barrel at the bottom of l CHISEL-RETAINER LOCK in the depending application. of AZielILeVedahl, filed February 10,1922, Serial No.7,

In accordance with my invention, the bartainer sleeve 3 is provided with a complementa'ry' internal screw thread 10 .whereby the sleeve 3 may be screwed on the barrel 1; b At the innerendof'the sleeve 3, the barrel lis provided with an exterior annular groove 11, in which is placeda spring clip 12. a I Said clip 12 is split at one point of its circumference, as shown in Fig.4, and has'one of its split or severed .ends turned inward to provideia flange 13. This flange 13 engages in a recess'or' slot 14 formed in the bottom of the groove 11 and extending across the same. The spring clip 12 is made normally smaller thegroove'll so that it tightly embracesand grips the barrel in said groove.) To engage the retainer sleeve 3, the other end 15 of said clip 12 is bent outward to enter a notch 16 in said sleeve 3,asshown in Figs. 1 and 3. V I

,When i the sleeve 3 is screwed up on the barrel, it extends partly over the spring clip 12, as indicated in, Figs. 1' and 2, and depresses the end 15 of the spring, This end .15 will snapinto the notch 16 and lock the sleeve 3 on the barrel andhold itfrom unscrewings tool While running or otherwise, to unscrew the sleeve 3 will expand-the spring clip 12 into tight contact with the bore of the sleeve aowing to thefact that thespring has one end-fixedto thefbarrel 1 and the other end to the sleeve 3. The groove 11 is made shallow so that its depth willrapproxiinatevthe thicka direction to ratchetunder the notch, 16 as thefsleevefi is turned on thebarrel, but engages one edge of the notch 16 to resist move ment of the sleeveigiwhen turned in a directlOIl'f to unscrew it from the'barrel. The more pressure exerted to unscrew the sleeve 8,- the V'Any attempt, due to jar and vibration of the I e 7 7 tight contact with the sleeve for locking the tigliterthe lock between the spring clip 12 inner end of the sleeve 3,'the clip 12 is. readily accessible for depression of its end 15mm the deeper p0rtion'17 of thej -sl-otil l to release the sleeve. This deeper portion 17 is about one-thirdof the groove, thus aking the clip o 12griptwo-thirds oi it. r

- lock betweentheiparts. -The'end 15 'ofthe The lock of my inventionlis simple in constrncti'on and operation and efl ective for the "pnrpose designed, in that itpositivelyand-se cit-rely locks *the retainer sleeve 3 against 7 movement on the end of the barrel underthe vibrations to whicha tool of this kind is sub-' j ected when in use. Moreover, the loekprevents the retainer sleeve -3' from being loose or movedo fl the bar-rel as the tool is transported from place toplace and =comesint0 contact with surrounding objects. The lock enables a one piece retainer sleeve 3 tQ 'be employed, and the spring'clip '12} is so constructed that any movement of the sleeve 3 in a direction to spread the clip 12 only makestighter the clip12 moreover does not project beyond the barreland thereforeisnotin the way to be injured or catch in surrounding objects as't he tool is ha'ndled and used. The parts fitting tight and -snug,' there-is nothing to jarloose or break,and -moreover no deep holes-or cavities need be cut in thebarrel toreceive the partsgand thus the barrelnot weakened and made liable to breakage.

While I have shown and described herein in detail a lock of any invention, it is of-course to be understood that the details of constr uction may be variously changed and modified without departing from theyspirit scope of my invention.

I clai-m as my invention t a r 1. In a: percussive tool, the combination wi-t h 'a barrel, of a chisel retainerfor the'barbel including a sleeve threaded on said barrel,

c jba rrel beneath a portion otsai d sleeve, said clip tightly gripping the barrel 'an'd having and a split spring clip extending about the one end in fixed engagement therewithand the other end in engagement with said sleeve, theportion of the sleeve at the clip closely surrounding the same and being engaged by the clip in a manner tojexp'and the clip into latter on the barrelon'turning. the sleeve in a direction to unscrew from -the barrel.

'2.:In a pereusslve tool, the 'COTDbIHalZTOIL with a barrel, of a-chisel retainer-for the bar ingengagement therewith;

r el,including a sleeve threaded on said barrel, and a split spring clip extending about the barrel beneath the inner end of said sleeve, said clip tightly gripping the barrel and havi'ngon'e end in fixed engagement therewith and :the other end in releasable connection with the sleeve, the inner end otthesleeve gaged thereby in a mannerto expand the clip into tight 'contact withfthe sleevefor {l'o'ck-*- ing' the latter on the barrel on turning the sleeve in. a direction to unscrew it from the barreh s aid'barrelhaving a depression so 7 disposedrras to permlit the end of the clip at g the sleeve to be pressed inward out of lockclosely surrounding the clip-and being ena :a gpercussive tool," the combination with a'barrel, of chisel retainer torthe i'barrel, including-a sleeve; threaded on: the barrel, and a split spring clip extending about the barrel beneath: the inner *end of said. sleeve,

said *elip tightly engaging L the barrel land 1 having one ien d inturnedto engage in are'cess. in the barrelxand' the" other end: out-turned to releasably engage in anotch in the inner end of the sleeve, the inner endofithesleeve olose- I 1y. surrounding v the clip and being engaged thereby in: a manner ,to expand' the clip: into tight contact with the sleeve for locking the latter on the; barrel; on" turning; the sleeve in a'di'rection to unserewit from the barrel,"said barrel havinga depression to permit. theoutturned end of the clipLt-obepressed inward out of locking engagement 'with the sleeve, 7

said out-turned end of the clip projecting laterally ibeyoird-rthe innerxend of the sleeve to be accessibleifor depressing.

4. Ina percussive :tool, the combination with :a :barrel having an exterior annular groove, 'of acchisel retainer for the barrel in:

cluding a sleevelscrewed on the barrel andhaving its innenuendiextendmg'over said groove, iaind a; split spring clip "extending about the barrel said; groove, said. clip,v tightlygripping the barrel about the bottom Off sairlie'groove and-having, one-rend bent inwardrtoengageiarecessinethe bottom of the.

groove Panel the' other end bent? outward to engageia notchein the overhanging; inner end of theisleeve; ithe inner end-of the latter gcl'oseri ly surrounding the clip .sozthat the ,clip will i be expanded into tight. contact with the sleeve v 1 the are

foraloc'kingthe latterz ontheubarrelon turning .the' sleeyetin a direction; to unscrew it from the barrel, said, groove -be1ng ;deeper at said notch; toiipermit the out-turned end; of

from said sleeve. 7

-. "l5. In-a percussive tool,'i thei' combination with a 5 barrel liavingfian .-;exterior annular rec 'the-cliptobe'pressedsinwarda-ndbe rel-eased V.

groove, of a chiselzreta-ineriorQthe-barrel in- 7 eluding a :sleeve threaded. on: the: barrel and having. its inner end extending partially a'cross 'said :groove', a flat split springrclipvex l tending; aboutthe. barrel; in'zsaid ,groove :and

substantially fitting the same so as to project beyond the inner endof the' sleeve, said clip having one end engaged in a recess in the 7 barrel and the other end out-turned and rej V leasably engaging a notch in theinner end of said sleeve, said groove having a depth substantially equal to the thickness of the clip so that the latter may normally tight-f p ly grip the barrel in the groove and be expanded into tight contact with the closely surrounding innerend of the sleeve on turning the latter in a direction to unscrew it from the barrel, said groove being deeper at the notch'to permit the out-turned end of the clip to bepressed inward and be released from the sleeve. 7

In testimony that I claim the foregoing as my invention, I affix my signature this 25th day of June, 1923.

-REINHOLD A. NORLING, 

